In the ROADM, which of the following layer of OTN paths do not need to be manually configured, it can be obtained directly by path search? (Multiple Choice)

In the ROADM, which of the following layer of OTN paths do not need to be manually configured, it can be obtained directly by path search? (Multiple Choice)
A . OTS
B . OSC
C . OMS
D . OCh

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Answer: ABCD